First off, let him settle in a bit. Bond. Hang out, work on house rules. Figure out what drives him, food, toys,praise.

Then use that as a reward. Start small, just like with a puppy. Reward when he offers a behavior you like. If he comes over and sits in front of you, reward him, "say good sit!!!" Then build on that. Work on one or two things a day. Don't overwhelm. Stay positive. Make him want to please you!! Be a kind and fair leader.